Ic Regulator Assembly
WARNING: This page is about a different car, the 2002 Isuzu Trooper and 2001 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
Check for continuity across "B" and "F" in the X 100W range of multimeter. See Fig 1 . Change polarity, and ensure that there is continuity in one direction, and not in the reverse direction. In case of continuity in both directions, replace the IC regulator assembly.